Answered how much excess power is there in that power supply?

I haven't looked under it (its always running) Robo is 360 watts right? 12v 30 amps? heaters are 40w, fans.. a couple more. no idea what the ramps needs beyond the connected hardware. Stepper about 15 watts a piece but is that under load or free spinning? And if so, the current draw of a loaded motor?
Arduino board, no idea.. it says "mega".. so.. ? lights and lcd controller... its adding up.

Normal economy says go with just a touch more than you need. But with these things being prone to modification, did they give us considerably more than we need?

No grand plans, but I've added a few bits of load. Don't know how far I can go. I hear the fan kick on, or hit max every minute or so... but that may not indicate anything. when do you throw on an old computer atx power supply?
Like to keep it portable.

 

HBP: 130W
Heater: 40W (Possibly 25w, need to measure the resistance)
Steppers: ~5W each, Total of 25W assuming all are running
Fans: ~3W
LED Strip: ~5w (assuming 20 LED's pulling 20mA per)

Those are the big power hogs. You might pull a few mW from the thermistors and endstop logic and maybe a little more from the arduino, but nothing significant.

I'd say 16A or ~190W is used, leaving 110W available.

 

Ah... The hbp... Thats a biggie i forgot... Thanks.

 

I was looking into upgrading the heater to a 280w silicone model but I'm thinking the stock PS on the Robo won't be able to handle the initial heater start up. If my calculations are correct it will draw 23 Amps at max which will probably blow the fuse or just fry the PS. Is it possible to run two power supplies at the same time? And how much power can the arduino board handle?

Thanks for any and all replies, Datum

 

I think the question there would be how to properly wire things in so that the bed heater is controlled by the arduino/ramps, but actually powered by a secondary power supply.

 

Anyone have a link to the kind of switch you're talking about?

Pretty much the only thing I haven't upgraded/replaced is the bed heater and I figure if I'm going to do it I might as well go for something that will actually improve the heatup/performance of the heated bed.

 

Great minds think alike. That's exactly why i have already ordered a ssr and a custom silicone heater with 120Vac for the power source.Thank you for the reply, Now I feel a little more confident in the way I'm heading.

 

I have also ordered some custom made high borosilicate glass 6mm thick hoping it will retain more heat and smooth out any wild temperature fluctuations. Had to order more than one to make it economical because the shipping was really high.

 

@WheresWaldo

Well it all started while removing a part, my bed chipped and cracked and the heater went out . I figured that I would go ahead and get a thicker plate and bigger heater. Ordered the same size plate I think 255mm X 385mm and ordering some silicone heaters that will be 230mm by 255mm Single-Ply, one to operate on 12vdc the other on 120vac. Going to see which one works best hopefully without taking out the power supply. Had an issue early on with the original power supply, apparently a solder point, was just that, a point and it dug its way thru the plastic shield inside and shorted on the PS enclosure. Luckily I was there and saw it spark, so I quickly shut it down and tore into it and fixed the problem and the power supply is still humming along, So far.